i think there is only one focus of ellipse and we can draw a ellipse with a single focus. please correct my thinking.
Your thinking makes no sense. You may be thinking of a parabola. If you are really thinking of an ellipse, then you just need to study them more.i think there is only one focus of ellipse and we can draw a ellipse with a single focus. please correct my thinking.
If you spend any time studying the math of the ellipse it is very obvious why it has to focii. It's all there in the math and it's not hard. I'm puzzled by your confusion. Have you used the equation of an ellipse to draw one?so please explain me why ellipse has two focus
Ah, I see your confusion now. Just keep in mind that it is sometimes true that you can use different forms to describe the same thing but if they are indeed describing the same thing, then they have to be equivalent.there are two definitions of ellipse one is the sum of the distance of a point from two foci is constant and another one is related to eccentricity. i was confused with the proof of the equation of ellipse using second definition because they have used only one foci and one directrix, which made me confused that why there are two foci, but now i got it. thank you my friends. this is the reason why i love physics forum
The requirement of two foci comes from the definition. The set of points in a plane whose sum of distance from two fixed points are equal. Said better in the first paragraph of this article: https://en.wikipedia.org/wiki/Derivation_of_the_Cartesian_form_for_an_ellipse [Broken]i think there is only one focus of ellipse and we can draw a ellipse with a single focus. please correct my thinking.
Now that this topic has be discussed rather well, we can state that the name mfb refers to is "circle".How would such an ellipse look like? Did you draw one, and if yes, how?
There are ellipses where both focal points are at the same place, but this special case has a different name which is usually preferred.